Major Sedimentary Basins in India.

The sedimentary basins of India, onland and offshore up to the 200m isobath, have an areal extent of about 1.79 million sq. km. So far, 26 basins have been recognized and they have been divided into four categories based on their degree of prospectivity as presently known. In the deep waters beyond the 200m isobath, the sedimentary area has been estimated to be about 1.35 million sq. km. The total thus works out to 3.14 million sq. km.

 

Over the last twelve years, there have been significant forward steps in exploring the hydrocarbon potential of the sedimentary basins of India. The unexplored area has come down to 15% which was 50% in 1995-96.

 

Credit for this achievement goes in large measure to the surveys carried out by DGH in unexplored/poorly explored areas of the country including Deepwaters off west coast, east coast and in Andaman sea and acreages awarded for exploration under NELPs. Concerned efforts are continuously being done to reduce the unexplored area further.

 

On the basis of prospectivity basins have been categorised as follows:

Category : Proven Commerical Productivity

Basin Name Onland Area Offshore Area Total
Assam-Arakan 116000 - 116000
Cambay 51000 2500 53500
Cauvery 25000 30000 55000
Krishna-Godawari Offshore 28000 24000 52000
Mumbai Offshore - 116000 116000
Rajasthan 126000 - 126000

Category : Identified Prospectivity

Basin Name Onland Area Offshore Area Total
Kutch 35000 13000 48000
Mahanadi-NEC 55000 14000 69000
Andaman-Nicobar 6000 41000 47000

Category : Prospective Basins

Basin Name Onland Area Offshore Area Total
Bengal 57000 32000 89000
Ganga 186000 - 186000
Himalyan Foreland 30000 - 30000
Kerla-Konkan Lakshdweep - 94000 94000
Saurashtra 52000 28000 80000
Vindhyan 162000 - 162000

Category : Potentially Prospective

Basin Name Onland Area Offshore Area Total
Bastar 5000 - 5000
Bhima Kaladgi 8500 - 8500
Chhattisgarh 32000 - 32000
Cuddapah 39000 - 39000
Deccan Syneclise 273000 - 273000
Karewa 3700 - 3700
Narmada 17000 - 17000
Pranhita Godavari 15000 - 15000
Satpura-S.Rewa-Damodar 46000 - 46000
Spiti Zanskar 22000 - 22000